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42 lines
1018 B
C++
42 lines
1018 B
C++
#include "hardware.h"
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#include "console.h"
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#include "error.h"
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namespace boot {
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namespace hw {
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void *
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find_acpi_table(uefi::system_table *st)
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{
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status_line status(L"Searching for ACPI table");
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// Find ACPI tables. Ignore ACPI 1.0 if a 2.0 table is found.
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uintptr_t acpi1_table = 0;
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for (size_t i = 0; i < st->number_of_table_entries; ++i) {
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uefi::configuration_table *table = &st->configuration_table[i];
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// If we find an ACPI 2.0 table, return it immediately
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if (table->vendor_guid == uefi::vendor_guids::acpi2)
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return table->vendor_table;
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if (table->vendor_guid == uefi::vendor_guids::acpi1) {
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// Mark a v1 table with the LSB high
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acpi1_table = reinterpret_cast<uintptr_t>(table->vendor_table);
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acpi1_table |= 1;
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}
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}
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if (!acpi1_table) {
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error::raise(uefi::status::not_found, L"Could not find ACPI table");
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} else if (acpi1_table & 1) {
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status_line::warn(L"Only found ACPI 1.0 table");
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}
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return reinterpret_cast<void*>(acpi1_table);
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}
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} // namespace hw
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} // namespace boot
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